extension

extension

[ek-sten´shun]

1. the movement by which the two ends of any jointed part are drawn away from each other.

2. a movement bringing the members of a limb into or toward a straight condition.

Buck's extension a temporary type of lightweight traction applied to the distal end of a fractured lower limb; the foot of the bed is raised so that the body makes counterextension; often used to reduce muscle spasm.

Buck's extension.

nail extension extension exerted on the distal fragment of a fractured bone by means of a nail or pin driven into the fragment.

ex·ten·sion

(eks-ten'shŭn), [TA]

1. The act of bringing the distal portion of a joint in continuity (although only parallel) with the long axis of the proximal portion.

2. A pulling or dragging force exerted on a limb in a distal direction.

3. The movement produced by contraction of one or more extensor muscles; it generally results in the straightening of a limb; axial traction that generally lengthens a limb or straightens the trunk; the opposite or antagonistic movement of flexion.

extension

1. the movement by which the two ends of any jointed part are drawn away from each other.

2. the bringing of the members of a limb into or toward a straight condition.

nail extension extension exerted on the distal fragment of a fractured bone by means of a nail or pin (Steinmann pin) driven into the fragment.

extension

(ĭk-stĕn′shən)

n.

1.

a. The act of straightening or extending a limb.

b. The position assumed by an extended limb.

2. Medicine The application of traction to a fractured or dislocated limb to restore the normal position.

ex·ten′sion·al adj.

extension

[iksten′shən]

Etymology: L, extendere, to stretch

a "straightening" movement allowed by certain joints of the skeleton that increases the angle between two adjoining bones, such as extending the leg, which increases the posterior angle between the femur and the tibia. Compare flexion.

extension

An adult sex toy placed around an erect penis which extends its length.

extension

The making larger of a thing Imaging The broadening of a lesion–eg, a cancer or focus of infection as seen on an imaging technique Orthopedics A ↑ in the angle between parts of a joint; a straightening of a flexed limb Terminal care See Extension of life.

ex·ten·sion

(eks-ten'shŭn) [TA]

1. The act of bringing the distal portion of a joint in continuity with the long axis of the proximal portion.

2. A pulling or dragging force exerted on a limb in a distal direction.

3. To straighten a joint (i.e., the elbow is in extension when fully straightened).

[L. extensus, past part. of extendere, to stretch out, extend]

extension

Straightening at a joint. The opposite of flexion.

Figure 1: The sites of the main nerve centres and descending pathways in the brain and spinal cord that control voluntary movement, represented in diagrammatic sections.

extension

a movement at a joint that increases the joint angle, e.g. straightening the leg at the knee or the arm at the elbow, moving the hand backwards at the wrist; or one involving several joints that brings dorsal surfaces nearer together, e.g. extending the neck to tilt the head backwards or curving the spine backwards. extensor muscles those with this action, e.g. triceps acting at the elbow, quadriceps at the knee. Opposite of flexion. Figure 1.

extension

joint movement, so that dorsal aspects of adjacent body segments move towards one another (opposite to flexion)

extension,

n movement of a limb to increase the angle of the joint. Some joints (at the wrist, in the neck) are able to hyperextend.

extension, bilateral sacral,

n condition in which the sacrum has rotated around a central transverse axis so that the sacral base moves posterior relative to the bones of the pelvis. Also called sacral base posterior.

extension, craniosacral,

n the movement of the cranial rhythmic impulse, characterized by anterior motion of the sphenobasilar symphysis and posterior motion of the sacrum.

extension, regional,

n straighten-ing of spinal region in the sagittal plane. Also called Fryette regional extension.

extension, sacral,

n posterior movement of the sacral base relative to the hip bones.

extension, SBS,

n rotation of the occipital and sphenoid bones in opposing directions about parallel transverse axes, thus resulting in inferior positioning of the basilar portions of both bones and a decrease in the posterior convexity between them. Also called sphenobasilar synchondrosis (symphysis) extension.

n a principle of cavity preparation promoted by G.V. Black. To prevent the recurrence of decay, he advocated extension of the preparation into an area that is readily polished and cleaned. The philosophy is no longer used in dentistry.

extension base, gingiva, attached,

n a gingival extension operation; a surgical technique designed to broaden the zone of attached gingiva by repositioning the mucogingival junction apically.

extension base, groove,

n the enlargement of a cavity preparation outline to include a developmental groove.

extension base of benefits,

n an extension of eligibility for benefits for covered services, usually designed to ensure completion of treatment commenced before the expiration date. Duration is generally expressed in terms of days.

extension base, ridge,

n an intraoral surgical operation for deepening the labial, buccal, or lingual sulci.

extension

1. the movement by which the two ends of any jointed part are drawn away from each other.

2. a movement bringing the members of a limb into or toward a straight condition.

nail extension

extension exerted on the distal fragment of a fractured bone by means of a nail or pin (Steinmann pin) driven into the fragment.

Parameters such as shear and extensional stress and rate, temperature and/or relative velocity all give insight into the process, particularly when there are defined values that yield optimal performance.

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